Meiotic arrest compromises pollen fertility in an interspecific hybrid between Brachiaria ruziziensis x Brachiaria decumbens (Poaceae: Paniceae).
Microsporogenesis was analyzed in an interspecific hybrid between an artificially tetraploidized sexual accession of Brachiaria ruziziensis (2n=4x=36) and a natural apomictic tetraploid accession of B. decumbens. Syncytes involving a large number of cells were recorded in 15.4% of meiocytes. Meiosis progressed normally in syncytes during prophase I; in metaphase I, however, several nuclei were found fusioned, showing chromosome stickiness and several chromosome fragments. Meiosis was arrested in metaphase I and pycnotic nuclei and micronuclei were formed. Abnormal cytokinesis fractionated the syncyte into abnormal meiotic products that were covered by the pollen wall. Meiocytes in leptotene were recorded in all the slides prepared for both meiotic divisions, and abnormal ?pollen grains? with well-developed pollen wall but containing leptotene nuclei were recorded in 9.18% of grains analyzed. These findings suggested that the meiocytes received the signal to enter meiosis but lacked the signal to proceed beyond leptotene. Despite the absence of the meiotic process, such cells were covered by pollen grain wall. Total pollen sterility resulted from these abnormalities combined with still others observed among meiocytes.
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Format: | Artigo de periódico biblioteca |
Language: | Ingles English |
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2008-02-01
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Subjects: | Apomixia, Brachiaria Decumbens, Brachiaria Ruziziensis, Citogenética Vegetal, Esterilidade, Fertilidade, Gramínea Forrageira, Hibridação, Hibrido, Melhoramento Genético Vegetal, Planta Forrageira, Pólen, Cell fusion, Cytogenetics, Hybridization, Hybrids, Microsporogenesis, Plant breeding, Poaceae, Pollination, |
Online Access: | http://www.alice.cnptia.embrapa.br/alice/handle/doc/326408 https://doi.org/10.1590/S1516-89132007000500011 |
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dig-alice-doc-3264082023-06-19T20:26:48Z Meiotic arrest compromises pollen fertility in an interspecific hybrid between Brachiaria ruziziensis x Brachiaria decumbens (Poaceae: Paniceae). MENDES-BONATO, A. B. PAGLIARINI, M. S. VALLE, C. B. do ANDRÉA BEATRIZ MENDES-BONATO, UNIVERSIDADE ESTADUAL DE MARINGÁ; MARIA SUELY PAGLIARINI, UNIVERSIDADE ESTADUAL DE MARINGÁ; CACILDA BORGES DO VALLE, CNPGC. Apomixia Brachiaria Decumbens Brachiaria Ruziziensis Citogenética Vegetal Esterilidade Fertilidade Gramínea Forrageira Hibridação Hibrido Melhoramento Genético Vegetal Planta Forrageira Pólen Cell fusion Cytogenetics Hybridization Hybrids Microsporogenesis Plant breeding Poaceae Pollination Microsporogenesis was analyzed in an interspecific hybrid between an artificially tetraploidized sexual accession of Brachiaria ruziziensis (2n=4x=36) and a natural apomictic tetraploid accession of B. decumbens. Syncytes involving a large number of cells were recorded in 15.4% of meiocytes. Meiosis progressed normally in syncytes during prophase I; in metaphase I, however, several nuclei were found fusioned, showing chromosome stickiness and several chromosome fragments. Meiosis was arrested in metaphase I and pycnotic nuclei and micronuclei were formed. Abnormal cytokinesis fractionated the syncyte into abnormal meiotic products that were covered by the pollen wall. Meiocytes in leptotene were recorded in all the slides prepared for both meiotic divisions, and abnormal ?pollen grains? with well-developed pollen wall but containing leptotene nuclei were recorded in 9.18% of grains analyzed. These findings suggested that the meiocytes received the signal to enter meiosis but lacked the signal to proceed beyond leptotene. Despite the absence of the meiotic process, such cells were covered by pollen grain wall. Total pollen sterility resulted from these abnormalities combined with still others observed among meiocytes. 2023-06-19T20:26:48Z 2023-06-19T20:26:48Z 2008-02-01 2007 Artigo de periódico Brazilian Archives of Biology and Technology, v. 50, n. 5, p. 831-837, Sep. 2007. http://www.alice.cnptia.embrapa.br/alice/handle/doc/326408 https://doi.org/10.1590/S1516-89132007000500011 Ingles en openAccess |
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Apomixia Brachiaria Decumbens Brachiaria Ruziziensis Citogenética Vegetal Esterilidade Fertilidade Gramínea Forrageira Hibridação Hibrido Melhoramento Genético Vegetal Planta Forrageira Pólen Cell fusion Cytogenetics Hybridization Hybrids Microsporogenesis Plant breeding Poaceae Pollination Apomixia Brachiaria Decumbens Brachiaria Ruziziensis Citogenética Vegetal Esterilidade Fertilidade Gramínea Forrageira Hibridação Hibrido Melhoramento Genético Vegetal Planta Forrageira Pólen Cell fusion Cytogenetics Hybridization Hybrids Microsporogenesis Plant breeding Poaceae Pollination |
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Apomixia Brachiaria Decumbens Brachiaria Ruziziensis Citogenética Vegetal Esterilidade Fertilidade Gramínea Forrageira Hibridação Hibrido Melhoramento Genético Vegetal Planta Forrageira Pólen Cell fusion Cytogenetics Hybridization Hybrids Microsporogenesis Plant breeding Poaceae Pollination Apomixia Brachiaria Decumbens Brachiaria Ruziziensis Citogenética Vegetal Esterilidade Fertilidade Gramínea Forrageira Hibridação Hibrido Melhoramento Genético Vegetal Planta Forrageira Pólen Cell fusion Cytogenetics Hybridization Hybrids Microsporogenesis Plant breeding Poaceae Pollination MENDES-BONATO, A. B. PAGLIARINI, M. S. VALLE, C. B. do Meiotic arrest compromises pollen fertility in an interspecific hybrid between Brachiaria ruziziensis x Brachiaria decumbens (Poaceae: Paniceae). |
description |
Microsporogenesis was analyzed in an interspecific hybrid between an artificially tetraploidized sexual accession of Brachiaria ruziziensis (2n=4x=36) and a natural apomictic tetraploid accession of B. decumbens. Syncytes involving a large number of cells were recorded in 15.4% of meiocytes. Meiosis progressed normally in syncytes during prophase I; in metaphase I, however, several nuclei were found fusioned, showing chromosome stickiness and several chromosome fragments. Meiosis was arrested in metaphase I and pycnotic nuclei and micronuclei were formed. Abnormal cytokinesis fractionated the syncyte into abnormal meiotic products that were covered by the pollen wall. Meiocytes in leptotene were recorded in all the slides prepared for both meiotic divisions, and abnormal ?pollen grains? with well-developed pollen wall but containing leptotene nuclei were recorded in 9.18% of grains analyzed. These findings suggested that the meiocytes received the signal to enter meiosis but lacked the signal to proceed beyond leptotene. Despite the absence of the meiotic process, such cells were covered by pollen grain wall. Total pollen sterility resulted from these abnormalities combined with still others observed among meiocytes. |
author2 |
ANDRÉA BEATRIZ MENDES-BONATO, UNIVERSIDADE ESTADUAL DE MARINGÁ; MARIA SUELY PAGLIARINI, UNIVERSIDADE ESTADUAL DE MARINGÁ; CACILDA BORGES DO VALLE, CNPGC. |
author_facet |
ANDRÉA BEATRIZ MENDES-BONATO, UNIVERSIDADE ESTADUAL DE MARINGÁ; MARIA SUELY PAGLIARINI, UNIVERSIDADE ESTADUAL DE MARINGÁ; CACILDA BORGES DO VALLE, CNPGC. MENDES-BONATO, A. B. PAGLIARINI, M. S. VALLE, C. B. do |
format |
Artigo de periódico |
topic_facet |
Apomixia Brachiaria Decumbens Brachiaria Ruziziensis Citogenética Vegetal Esterilidade Fertilidade Gramínea Forrageira Hibridação Hibrido Melhoramento Genético Vegetal Planta Forrageira Pólen Cell fusion Cytogenetics Hybridization Hybrids Microsporogenesis Plant breeding Poaceae Pollination |
author |
MENDES-BONATO, A. B. PAGLIARINI, M. S. VALLE, C. B. do |
author_sort |
MENDES-BONATO, A. B. |
title |
Meiotic arrest compromises pollen fertility in an interspecific hybrid between Brachiaria ruziziensis x Brachiaria decumbens (Poaceae: Paniceae). |
title_short |
Meiotic arrest compromises pollen fertility in an interspecific hybrid between Brachiaria ruziziensis x Brachiaria decumbens (Poaceae: Paniceae). |
title_full |
Meiotic arrest compromises pollen fertility in an interspecific hybrid between Brachiaria ruziziensis x Brachiaria decumbens (Poaceae: Paniceae). |
title_fullStr |
Meiotic arrest compromises pollen fertility in an interspecific hybrid between Brachiaria ruziziensis x Brachiaria decumbens (Poaceae: Paniceae). |
title_full_unstemmed |
Meiotic arrest compromises pollen fertility in an interspecific hybrid between Brachiaria ruziziensis x Brachiaria decumbens (Poaceae: Paniceae). |
title_sort |
meiotic arrest compromises pollen fertility in an interspecific hybrid between brachiaria ruziziensis x brachiaria decumbens (poaceae: paniceae). |
publishDate |
2008-02-01 |
url |
http://www.alice.cnptia.embrapa.br/alice/handle/doc/326408 https://doi.org/10.1590/S1516-89132007000500011 |
work_keys_str_mv |
AT mendesbonatoab meioticarrestcompromisespollenfertilityinaninterspecifichybridbetweenbrachiariaruziziensisxbrachiariadecumbenspoaceaepaniceae AT pagliarinims meioticarrestcompromisespollenfertilityinaninterspecifichybridbetweenbrachiariaruziziensisxbrachiariadecumbenspoaceaepaniceae AT vallecbdo meioticarrestcompromisespollenfertilityinaninterspecifichybridbetweenbrachiariaruziziensisxbrachiariadecumbenspoaceaepaniceae |
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1775947619357425664 |